Introduction

Mokku is off by default and does nothing until you enable it for a specific origin. Once on, it intercepts all fetch and XHR calls and serves any mock you’ve defined. You can also modify request headers directly from the tool.

Mokku is free, runs entirely in your browser, and stores all data locally — no cloud unless you opt in.

What you can do

Mock APIs Static and dynamic URL matching, response functions, GraphQL support, and more.

Mock Headers Set, append, or remove headers globally or per URL — with dynamic URL filtering.

Projects Organise mocks and headers into projects. Enable cloud sync per project.

Teams & Orgs Collaborate with your team. Share projects across members.

Quick start

1. Install the extension

   Install Mokku from the Chrome Web Store.

2. Open DevTools

   Open Chrome DevTools (F12 or Cmd+Option+I) and find the Mokku tab next to Network.

3. Enable for your origin

   Toggle Mokku on for the site you’re working on. It will start intercepting requests.

4. Add a mock

   Go to the Mocks section, select a project, and click Add Mock.